Thank you to Pierre Divenyi, Jeffrey Sable, Trevor Agus and Al Bregman for
writing in with their ideas.

The way I have it set up now, the first stimulus of the trial is always an
intact (no breaks) FM sweep.

The easiest thing for me to do now is to try different instructions and
simpler language. The next thing to do would be to use the excellent
suggestiong by Dr. Bregman of using breaks in both stimuli and notched
noise.